A program to convert between dates in the Chinese, Vietnamese and Japanese lunar calendars and dates in the Gregorian and Julian calendars, and to find lunar new year’s day and leap months for any year in the Asian calendars.
ActiveEarth is a world time clock with a gorgeous day / night merge of NASA’s earth images. It has accurate time zone data for every country, global current conditions and forecasts, countdown clocks, scalable analog clocks, screen saver, and more!
Combine multiple sights on different tracks. Data available for 9999BC to 9999AD including a Star Atlas, twilights and eclipses. It will print conventional Nautical Almanac pages while the voyage plan is a sophisticated tool in its own right.
Astronomical Tables in Python
Free and open source astronomical application for your Mac
Astronomical Information Processing System
Process astronomical images taken by webcam via telescope.
AstroPlanner – One of the best programs for observation planning and logging.